<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
         
        </thead>
        <tbody>
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>
            <td :class="{ red: item.price > 100 }">{{ item.price }}</td>
            <td>{{ formatDate(item.time)}}</td>
            <!-- 如果价格超过100，就有red这个类 -->
            <td><a href="#" @click="del(item.id)">删除</a></td>
          </tr>
           <tr><td>统计</td><td colspan="2">总价:{{totob}}</td><td colspan="2">均价:{{jun}}</td></tr>
        </tbody>

        <tfoot v-if="list.length == 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              v-model.trim="name"
              type="text"
              class="form-control"
              placeholder="资产名称"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              v-model.number="price"
              type="text"
              class="form-control"
              placeholder="价格"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button @click.prevent="add" class="btn btn-primary">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from "moment"
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
  list:JSON.parse(localStorage.getItem("shuju")||"[]")
    };
  },
  methods: {
    add() {
      if (
        this.name.length === 0 ||
        this.price.length <= 0 ||
        this.price == null ||
        this.price == 0||
        this.price<0
      ) {
        return alert("商品名称和价格不能为0");
      }

      this.list.push({
        id:
          this.list.length == 0 ? 100 : this.list[this.list.length - 1].id + 1,
        name: this.name,
        price: this.price,
        time: new Date(),
      });
      this.name = "";
      this.price = 0;
    },
    del(id) {
      let index = this.list.findIndex((item) => {
        return item.id === id;
      });
      this.list.splice(index, 1);
    },
    // 格式化时间
 formatDate(date){
    return moment(date).format("YYYY-MM-DD")
    }
  },
  computed:{
  totob(){
let sun=0
this.list.forEach((item)=>{
sun+=item.price
})
return sun
    },
    // 
    jun(){
   return  ( this.totob/this.list.length).toFixed(2)
    }
  },
  watch:{
    list:{
      deep:true,
      handler(newval){
localStorage.setItem("shuju",JSON.stringify(this.list))
      }
    }
  }
};
</script>

<style >
.red {
  color: red;
}
</style>